BIOS Initialization ESB2 BMC Core TPS
Revision 1.0
Intel order number E18291-001
150
Byte Name Description
20 Bit[0] – GlobalThrtEn "1" enables global throttling, GLOBTHRT_EN. Data format is
hexadecimal.
Bit[1] – ThermalThrtEn "1" enables closed-loop throttling, THERMTHRT_EN. Data format is
hexadecimal.
Bit[2] – HighTempEn "1" enables high DRAM temp operation when FBDIMM is capable,
HIGHTEMP_EN. Data format is hexadecimal.
Bits[3:7] – Reserved Reserved for future use.
21:24 Reserved Reserved for future use.
14.4.1.3 Static Open Loop Thermal Throttling (OLTT) Operation
If for any reason the system cannot be successfully configured for Static CLTT operation, the
BIOS programs the system for Static Open Loop Thermal Throttling (OLTT) operation instead.
This is in conformance with the requirements described in the Intel
®
Server System
S7000FC4UR Fan Speed Control and Thermal Management Platform Architecture Specification
(PAS).
If the system faults to programming for OLTT, then an Altitude setup option is made
configurable on the System Acoustic and Performance Configuration screen in BIOS setup.
The BIOS subsequently issues the BMC Set Fan Control Configuration command to inform the
BMC of the Fan Profile (acoustic or performance) selected by the user in BIOS Setup.
14.4.2 Processor Thermal Management
The processors implement a methodology for managing processor temperatures through
processor throttling. There are two components to the temperature calculation used to regulate
the processor temperature:
Tcontrol offset (BIOS sends this value to BMC)
Tcontrol base (BMC retrieves this value from SDR)
The BIOS retrieves the Tcontrol offset from a processor Model Specific Register (MSR) and
sends this value to the Baseboard Management Controller (BMC) by issuing the BMC Set
Processor Tcontrol command.
The BMC uses these two Tcontrol values to regulate processor thermal characteristics
according to the user-selected Fan Profile.
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